Zimbra jar files

Hi All,
I am trying to integrate on of my ERP application with Zimbra. I was able to get some zimbra jar files zimbracommon 6.0.3.jar, zimbra-integration-core-1.0.30.jar. But I could not see any documentation related to those jar files. I could find exact location when we can find more information about zimbra jars. Please provide me pointers?